Off-Design Performance Modeling of the Natural Gas-Fired Allam Cycle

Federico D’Ambrosio, Lorenzo Colleoni and Silvia Ravelli ()
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Federico D’Ambrosio: Department of Engineering and Applied Sciences, University of Bergamo, Viale Marconi 5, 24044 Dalmine, Italy
Lorenzo Colleoni: Independent Researcher, 24040 Bonate Sopra, Italy
Silvia Ravelli: Department of Engineering and Applied Sciences, University of Bergamo, Viale Marconi 5, 24044 Dalmine, Italy

Energies, 2025, vol. 18, issue 17, 1-22

Abstract: This work focuses on modeling the performance of the natural gas-fired Allam cycle under off-design conditions. Key thermodynamic parameters, such as turbine inlet pressure (TIP), turbine inlet temperature (TIT), and turbine outlet temperature (TOT), were evaluated at part-load and varying environmental conditions. In the former case, different control strategies were implemented in the simulation code (Thermoflex ® ) to reduce the power output. In the latter case, the impact of ambient temperature (T amb ) on the minimum cycle temperature (T min ) was evaluated. The ultimate goal is to predict the thermal efficiency (η th ) and its decrease due to partial load operation and warm climate, without thermal recovery from the air separation unit (ASU). With the most efficient partial load strategy, η th decreased from 50.4% at full load to 40.3% at about 30% load, at nominal T min . The penalty caused by the increase in T min due to hot weather, up to T amb = 30 °C, was significant at loads above 60%, but limited to 0.5 percentage points (pp).

Keywords: Allam cycle; decarbonization; part-load; off-design; thermal efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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